Resolved: Kerberos Server Outage
One of the three Kerberos servers, fido (188.8.131.52), crashed with a hardware failure at 4:56. The system was restarted and was functioning as of 6:56. The cause of the hardware failure is a bad memory DIMM and is offline. During the hardware failure users may have had issues with authenticating to services. After the fido was restarted, data replication of password changes were not completely caught up until 7:14. So, users may have received a failed authentication, if they changed their password from 4:56-7:14.